This mainly avoids protoc from 3.7.0 which has a dependency on libatomic. Most
of our systems have libatomic, so it mostly works, but the interop docker
container does not, so building fails. Version 3.7.1 was rebuilt to avoid
needing the libatomic shared library.
This has the added benefit that Bazel is now on the same version as Gradle, as
3.7.1 included fixes for Bazel.
The buildscript was updated to pull in a fix to protoc-artifacts to
support TLS 1.2 (google/protobuf#4879), which was the only remaining
reason to have our own container.
Docker container building was split out into a separate build_docker.sh
so that people can call it blindly and get the container necessary for
run_in_docker.sh.
Elliotte Rusty Harold
Carl Mastrangelo
Eric Anderson